Definition of kick someone in the pants or up the backside in English:

kick someone in the pants (or up the backside)

informal Prompt someone to make fresh effort.
More example sentences
  • I can barely spend time with my extended kin without the having the urge to kick them up the backside.
  • I have a reason to kick you in the pants and light fire under you to keep you focused and keep you going.
  • His advice is always timely, full of common sense and he never hesitates to kick me in the pants when necessary.
See parent entry: kick

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Pronunciation: ˈnɔɪs(ə)m
adjective
having an extremely offensive smell